Steps to Reproduce

run the attachment incorrect-popup-position.zul
click (B)

Current Result

popup opens in the wrong position (configured: after_end)

Expected Result

same relative (to button) position as when clicking button (A)

Debug Info

the position was still correct in version 8.5.1
->possible side effect of ZK-3902

Workaround

the position of the <popup> component in the component tree seems to affect this behavior
in this case moving the popup outside the window, or inside the hlayout fixes the problem.